抗干扰脉冲激光测距系统

A. Sadchenko, O. Kushnirenko, E. Koshelev
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引用次数: 0

摘要

脉冲激光测距仪由于其紧凑、便携和节能,在几十公里的距离上被证明是一种经济实用的设备。然而,在传感期间和接收反射信号时,由于存在影响光接收器输入的脉冲干扰,测量精度显著降低。使用对多次连续测量结果进行累积和后续处理的算法降低了决策速度,并且不能保证结果收敛到距离的真实值。本文提出了一种激光测距仪的结构框图,该测距仪具有探测距离间隔内的脉冲干扰和校正目标反射信号结构误差的能力。测距仪电路的基础是一个逻辑一致滤波器,其结构包含乘法器(乘法运算)。对探测信号的结构制定了以下要求:—第一个元素始终设置为+1以同步接收决策器;—编码序列的权重等于其长度的一半;—编码序列的长度为偶数。根据编码序列的要求,找到了长度为8的二进制探测信号的最优结构,具有最佳的校正能力。将得到的序列与用Walsh函数构造的序列进行相关性比较,结果表明以ACF旁瓣最小电平为准则的最优序列具有优势。对脉冲噪声条件下测距仪的仿真结果表明,当障碍物持续时间不超过探测信号持续时间的1/3时,采用逻辑滤波器是可取的。
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Anti-interference pulsed laser ranging system
Pulsed laser rangefinders prove to be cost-effective and practical devices when used at distances of several tens of kilometers due to their compactness, portability and energy efficiency. However, the measurement accuracy is significantly reduced by the presence of pulsed interference affecting the input of the optical receiver both during the sensing period and when the reflected signal is being received. Using the algorithms with the accumulation and subsequent processing of the results of several successive measurements reduces the speed of decision-making and does not guarantee the convergence of the results to the real value of the distance. The paper proposes a structural diagram of a laser rangefinder with the ability to detect pulsed interference in the range interval and correct errors that occur in the structure of the signal reflected from the target. The basis of the rangefinder circuit is a logical consistent filter, the structure of which contains multipliers (multiplication operations). The following requirements were formulated for the structure of the probe signal: — the first element should always be set to +1 to synchronize the receiver decider; — the weight of the coding sequence is equal to half its length; — the length of the coding sequence is even. Based on the requirements for coding sequences, the optimal structures of binary probing signals of length 8 were found, providing the best corrective ability. Comparison of the correlation properties of the found sequences and the sequences that are constructed using the Walsh functions showed the advantage of the optimal sequences by the criterion of the minimum level of the ACF side lobes. The simulation of the rangefinder under pulsed noise conditions has shown that the logical filter is advisable to use for those cases when the duration of the obstacle does not exceed 1/3 of the duration of the probing signal.
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